Problem P. 4101. (October 2008)
P. 4101. Several batteries, all having the same electromotive forces and the same internal resistances, were connected first in parallel and then in series and a resistor of resistance 129 was connected into the circuit. It was found that in case of the series connection the terminal voltage across each battery is 10% less than in case of the parallel connection. How many batteries were used?
Deadline expired on November 11, 2008.
71 students sent a solution. 4 points: 52 students. 3 points: 3 students. 2 points: 5 students. 1 point: 11 students.